Guitar music was another major focus of Moreno Torroba's career. He was the first to respond to the young Andrés Segovia
's request for new guitar works by modern composers, producing his Nocturno and Suite castellana for him in 1926. He went on to write many more works for Segovia
over the next four-plus decades, and for other guitarists like the flamenco master Sabicas and the guitar quartet Los Romeros
. By the end of his life he had composed over 100 works for the guitar, many of them strongly influenced by Spanish folk music.
In 1975, at age 84, Moreno Torroba became the president of the Sociedad de Autores Españoles. He continued composing right to the end of his life, even producing an opera at age 90, El Poeta (1980), for tenor Plácido Domingo
, with whose parents Moreno Torroba had worked decades earlier.